EP0489661A1 - Method of transmitting information by radio waves between a satellite and a plurality of ground stations, and arrangements for the implementation of the system - Google Patents

Method of transmitting information by radio waves between a satellite and a plurality of ground stations, and arrangements for the implementation of the system Download PDF

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Publication number
EP0489661A1
EP0489661A1 EP91403296A EP91403296A EP0489661A1 EP 0489661 A1 EP0489661 A1 EP 0489661A1 EP 91403296 A EP91403296 A EP 91403296A EP 91403296 A EP91403296 A EP 91403296A EP 0489661 A1 EP0489661 A1 EP 0489661A1
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EP
European Patent Office
Prior art keywords
satellite
transmitting
transmission
earth stations
information
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Granted
Application number
EP91403296A
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German (de)
French (fr)
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EP0489661B1 (en
Inventor
Jean-Jacques Poutrel
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POUTREL JEAN JACQUES
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POUTREL JEAN JACQUES
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Publication of EP0489661A1 publication Critical patent/EP0489661A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18532—Arrangements for managing transmission, i.e. for transporting data or a signalling message
    • H04B7/18536—Shadowing compensation therefor, e.g. by using an additional terrestrial relay

Definitions

  • the present invention relates to a method for transmitting information over the air between a satellite and a plurality of earth stations.
  • Such methods have been used for many years for very diverse civil and military applications.
  • the implementation of this method involves the use by each terrestrial site of reception and / or emission of special antennas adapted to the reception of centimeter waves coming from or intended for the satellite.
  • These antennas must also be located in areas in which the transmission conditions in the UHF or VHF bands are satisfactory. This is generally not the case in urban centers. Indeed, the frequency band used for the transmission between the satellites and the earth stations is chosen so as to minimize the disturbances originating from the partial reflection on the ionosphere. These frequency bands are not optimal for transmission in urban sites, where constructions using metallic materials prevent the propagation of signals.
  • the "IRIDIUM" network developed by the MOTOROLA company consists of using 77 satellites which communicate with portable equipment for areas with good reception of centimeter waves, and for other areas with relay stations connected to the traditional switched network. These ground centers represent significant investments and require heavy specific infrastructure.
  • the object of the present invention is to remedy these drawbacks by proposing an economical and efficient solution allowing communication between low power earth stations and reduced costs with a communication satellite.
  • the method according to the invention consists in integrating into a plurality of urban or rural layouts having a main function of signaling, decoration or presentation of information a first series of transmission and / or reception means. operating in the wavelengths used for the transmission of information with said satellite and at least a second series of transmission and / or reception means operating in a wavelength band compatible with the conditions of transmission between said second means and said earth stations, the range of said second means being less than the dimensions of the area of poor reception conditions of the centimeter waves.
  • the method according to the invention has many advantages. First of all, many arrangements are already implemented in urban areas, at particular points in the global area of poor transmission conditions in which connection with the satellite remains possible. These are, for example, road signs placed on the peripheral boulevards surrounding large urban centers, or display panels with an available interior volume making it possible to house a strong transmitter. power or a sensitive receiver as well as the corresponding antennas, and which in addition are generally already connected to a source of electricity. As a result, it is possible to build an efficient information transmission network without making significant investments to acquire or rent expensive locations for the establishment of ground stations. Furthermore, the method according to the invention avoids the excessive proliferation of technical stations in an urban setting which, due to public pressure, will present increasing requirements with regard to the protection of the aesthetic environment.
  • said arrangements consist of advertising panels connected to an energy source.
  • said arrangements are constituted by information panels comprising means for displaying visual messages.
  • Such signs often constitute a close mesh of an urban site. They are relatively well accepted both by local elected officials, as they constitute a vector of communication and promotion of their achievement, even of their image, as well as by the population who find useful cultural or practical information there. These panels have sufficient internal volume to accommodate all of the technical means of transmission.
  • the method according to the invention may include means for detecting a priority signal capable of triggering the emission of a radio broadcast message, and / or of triggering the display of a visual message on said arrangement. . This message can be an announcement of the impending natural or political disaster, or simply the prevention of a danger.
  • the method according to the invention consists in that one further integrates into said arrangements means for locating mobile earth stations capable of moving in the area of poor reception conditions, said locating means generating a signal representative of the position of said mobile earth station, said signal being transmitted to the satellite.
  • the present invention also relates to an advertising display panel for the implementation of the method described above, characterized in that it comprises a first antenna cooperating with means for transmitting and / or receiving signals from or intended for a satellite. communication, and a second antenna cooperating with means for transmitting and / or receiving signals from or intended for earth stations located in an area of poor centimetric wave transmission conditions.
  • the panel according to this embodiment can be substituted for an existing panel and fulfill a double display and relay function for the signals considered.
  • the invention consists of a display panel of visual information originating from a central server for managing information messages. It comprises a first antenna cooperating with means for transmitting and / or receiving signals from or intended for a communication satellite, and a second antenna cooperating with means for transmitting and / or receiving signals originating from or intended for earth stations located in an area of poor centimetric wave transmission conditions.
  • said visual information display panel further comprises a detector of a priority signal generating a signal to interrupt the display of the information message from said central server and causing the display of '' a priority information message and / or the transmission of a priority message over the air in the frequency band of receivers of earth stations.
  • the invention consists of a road sign comprising a first antenna cooperating with means for transmitting and / or receiving signals from or intended for a communication satellite, and a second antenna cooperating with means for transmitting and / or receiving signals from or intended for earth stations located in an area of poor centimetric wave transmission conditions.
  • the arrangement for implementing the invention comprises a transmitter capable of activating the transmission by an on-board system on a determined mobile land station of a coded signal, said coded signal being detected by a goniometric receiver equipping said arrangement, said arrangement further comprising means for transmitting to a communication satellite a signal relating to the position of said determined mobile earth station.
  • FIG. 1 represents an example of implementation of the invention.
  • the signals to be transmitted are, in the example described, broadcasting signals originating from the transmitter (1) of a radio station. These signals are of the digital type, and are transmitted in a known manner to a telecommunications satellite 2. This satellite re-transmits UHF signals in a frequency band between 1 Mhz and 1500 MHz.
  • a reception station (3) receives the digital signals coming from the satellite 2.
  • This reception station on the ground (4) is constituted by a signaling panel of known type. It is connected to the electrical energy distribution network to supply the display functions. This supply also serves to ensure the operation of the transmission and reception means.
  • the upper part of the panel has an oriented surface (4) in which is housed an antenna for receiving centimeter signals. The inclination and the size of the antenna are determined in a manner known to the skilled person.
  • the panel (3) further comprises a transmitter working at a frequency favorable to transmission in an urban area or more generally in an area in which the conditions of transmission of centimeter waves are poor.
  • the transmission frequency is of the order of 100 MHz.
  • the digital signals originating from the link with the satellite are retransmitted in the aforementioned wavelength in order to be received under satisfactory conditions by mobile receivers, or of small dimensions and of a low cost price.
  • these signals are received by receivers arranged in motor cars (5). This reception mode is also complementary with direct reception by certain vehicles (6) or by fixed stations of more elaborate design.
  • a second transmission center (7) can be provided for the transmission of warning signals.
  • This second transmission center (7) is intended to send priority alert messages. These messages are retransmitted like other satellite signals.
  • the ground station (3) comprises means for recognizing the warning signals, for example by means of a particular code constituting the preamble of the coded digital message. The recognition of such a character string triggers the interruption of non-priority transmissions and the transmission in the frequency band chosen for the ground communication of an alert message.
  • This alert message can also be sent at a frequency corresponding to the intermediate frequency of the receivers used by the users.
  • the recognition of the alert message can cause the appearance on the road sign (3) of the appearance of a message at least partially replacing the usual advertising or informational message.
  • This message is used to warn a large population of the impending natural danger such as an earthquake or a storm and to disseminate safety instructions.
  • FIG. 2 represents a view of another embodiment. It is more particularly intended for guiding a vehicle and managing a fleet of vehicles, for example delivery trucks or taxis, from a central transceiver and processing station.
  • the invention consists in setting up a mesh of tags (8) of short range integrated in furniture having another main function. These may for example be traffic lights constituting a dense network of an urban area, or direction indicator panel constituting an effective network of the road network.
  • At least some of these beacons comprise transmission-reception means operating in the centimeter band and communicating with the satellite (2).
  • These beacons (10) comprise an antenna for receiving centimeter-wide radio beams and / or for transmitting in said frequency band.
  • the connection between these main beacons (10) and the secondary beacons (8) is carried out either by radio link in frequency bands adapted to the transmission in the zone considered, or by a cable connection.
  • the secondary beacons (8) comprise means of communication with the main beacon or beacons (10) as well as means for exchanging information with onboard receivers and / transmitters.
  • the exchange of information between the secondary beacon (8) and a vehicle passing nearby makes it possible to locate said vehicle and to transmit its coordinates to the processing center (11).
  • This localization can be carried out by goniometric means, or by assigning to each beacon an address transmitted in the form of a coding sequence when a message is transmitted by said beacon (8).
  • the beacon (8) in this case further comprises a transmitter generating an activation signal of an on-board identification system in vehicles belonging to the fleet in question. Upon detection of this activation signal, the on-board transmitter responds with a coded signal comprising a digital vehicle identification sequence.
  • the beacon (8) receives this response and in turn transmits a signal comprising a first coded sequence allowing the identification of the beacon closest to the vehicle in question, and a second ccded sequence identifying said vehicle.
  • This coded signal is transmitted to the processing center (11) via the satellite (2).
  • FIG. 3 represents the block diagram of a traffic sign for the implementation of the invention.
  • an exemplary embodiment will be described corresponding to an urban information panel having a display window (12) for a text.
  • This type of sign is set up in many cities for the dissemination of information on municipal or cultural life, or even relating to traffic.
  • This panel is connected to the electrical distribution network as well as to a network (13) carrying the digital signals coming from a command center controlling the displays to be displayed on said panels.
  • the panel is provided with an antenna (14) for receiving and transmitting radio communication signals with a satellite.
  • This antenna (14) is connected on the one hand to a receiver (15) and on the other hand to a transmitter (16).
  • the digital signals from the receiver (15) are transmitted to a character sequence recognition device identifying priority alert messages.
  • said circuit recognizes the sequence announcing a priority message, it sends a signal to interrupt the display of messages broadcast on the network (13) to a circuit (18) and sends a digital signal to the character generator controlling the display. an emergency message on the panel (12).
  • the digital signals coming from the receiver (15) of the satellite signals are transmitted to a transmitter (20) after processing in a circuit (21).
  • the transmitter (20) is connected to a radiocommunication antenna (22) of known type.
  • the antenna also receives signals from the transmitters on board fleet vehicles. These signals are of two types: on the one hand, signals for locating the position of the vehicle emitted by an on-board transmitter activated by a signal emitted by the panel considered. These signals include a coded sequence allowing the identification of the vehicle. These signals are picked up by a first receiver (23) and transmitted to a multiplexer (24) receiving from a generator (25) also a coded sequence making it possible to identify the panel, and consequently the approximate position of the vehicle. The received signals also correspond to voice messages or coded signals, which are transmitted to the multiplexer (24) via a specific receiver (26). The management of these signals for sending in the form of packets as well as the coordination with the other panels re-transmitters are effected by means of the multiplexer (24) with which clock and synchronization circuits of known type are associated.

Abstract

The present invention relates to a method of transmitting information by radio waves especially between a satellite (2) and a plurality of ground stations (5), some at least of which are laid out in areas of poor conditions of transmission of centimetre waves. The said method consists in employing relays containing reception means and transmitter means. The invention consists more particularly in that, within a plurality of urban or rural arrangements (3) having a principal function of signalling, of decoration and/or of presentation of information, there is integrated a first series of means of transmission and/or of reception operating within wavelengths used for communicating with the said satellite and at least one second series of means of transmission and/or of reception operating within a wavelength band compatible with the conditions of transmission between the said second means and the said ground stations (5), the range of the said second means being less than or equal to the dimensions of the area of poor conditions of reception of centimetre waves. <IMAGE>

Description

La présente invention concerne un procédé de transmission d'informations par voie hertzienne entre un satellite et une pluralité de stations terrestres. De tels procédés sont mis en oeuvre depuis de nombreuses années pour des applications tant civiles que militaires très diverses. La mise en oeuvre de ce procédé implique l'utilisation par chaque site terrestre de réception et/ou d'émission d'antennes spéciales adaptées à la réception d'ondes centimètriques provenant ou destinées au satellite. Ces antennes doivent en outre être situées dans des zones dans lesquelles les conditions de transmission dans les bandes UHF ou VHF sont satisfaisantes. Cela n'est généralement pas le cas dans les centres urbains. En effet, la bande de fréquence employée pour la transmission entre les satellites et les stations terrestres est choisie de façon à minimiser les perturbations provenant de la réflexion partielle sur l'ionosphère. Ces bandes de fréquences ne sont pas optimales pour la transmission dans les sites urbains, où les constructions employant des matériaux métalliques empêchent la propagation des signaux. Par ailleurs, il est difficile, sinon techniquement, du moins économiquement, d'équiper des stations terrestres mobiles, par exemple des véhicules, voire des stations portables, d'antennes et de moyens de réception et/ou d'émission suffisamment performants pour pallier ce handicap. On a donc proposé dans l'art antérieur de créer des réseaux de réémetteurs. A titre d'exemple, le réseau "IRIDIUM" développé par la société MOTOROLA consiste à mettre en oeuvre 77 satellites qui communiquent avec des équipements portatifs pour les zones de bonne réception des ondes centimétriques, et pour les autres zones avec des stations-relais raccordées au réseau commuté traditionnel. Ces centres au sol représentent des investissements importants et nécessitent une infrastructure spécifique lourde. En outre, la densification de l'espace urbain rend difficile l'implantation de tels centres au sol à l'intérieur même de la zone de mauvaise transmission des ondes centimétriques, et implique donc la mise en place de moyens de transmission d'informations avec les stations terrestres de forte puissance, ou par câble coaxial supprimant la possibilité de liaison avec des stations mobiles.The present invention relates to a method for transmitting information over the air between a satellite and a plurality of earth stations. Such methods have been used for many years for very diverse civil and military applications. The implementation of this method involves the use by each terrestrial site of reception and / or emission of special antennas adapted to the reception of centimeter waves coming from or intended for the satellite. These antennas must also be located in areas in which the transmission conditions in the UHF or VHF bands are satisfactory. This is generally not the case in urban centers. Indeed, the frequency band used for the transmission between the satellites and the earth stations is chosen so as to minimize the disturbances originating from the partial reflection on the ionosphere. These frequency bands are not optimal for transmission in urban sites, where constructions using metallic materials prevent the propagation of signals. Furthermore, it is difficult, if not technically, at least economically, to equip mobile earth stations, for example vehicles, or even portable stations, with antennas and means of reception and / or transmission sufficiently efficient to overcome this handicap. It has therefore been proposed in the prior art to create networks of retransmitters. For example, the "IRIDIUM" network developed by the MOTOROLA company consists of using 77 satellites which communicate with portable equipment for areas with good reception of centimeter waves, and for other areas with relay stations connected to the traditional switched network. These ground centers represent significant investments and require heavy specific infrastructure. In addition, the densification of urban space makes it difficult to establish such centers on the ground to inside the zone of poor transmission of centimeter waves, and therefore implies the establishment of means of transmitting information with high power earth stations, or by coaxial cable eliminating the possibility of connection with mobile stations.

L'objet de la présente invention est de remédier à ces inconvénients en proposant une solution économique et efficace permettant la communication entre des stations terrestres de faible puissance et de coûts réduits avec un satellite de communication.The object of the present invention is to remedy these drawbacks by proposing an economical and efficient solution allowing communication between low power earth stations and reduced costs with a communication satellite.

A cet effet, le procédé selon l'invention consiste à intégrer dans une pluralité d'agencements urbains ou ruraux ayant une fonction principale de signalisation, de décoration ou de présentation d'informations une première série de moyens d'émission et/ou de réception opérant dans les longueurs d'onde utilisées pour la transmission d'informations avec ledit satellite et au moins une deuxième série de moyens d'émission et/ou de réception opérant dans une bande de longueur d'onde compatible avec les conditions de transmissions entre lesdits deuxièmes moyens et lesdites stations terrestres, la portée desdits deuxième moyens étant inférieure aux dimensions de la zone de mauvaises conditions de réception des ondes centimétriques.To this end, the method according to the invention consists in integrating into a plurality of urban or rural layouts having a main function of signaling, decoration or presentation of information a first series of transmission and / or reception means. operating in the wavelengths used for the transmission of information with said satellite and at least a second series of transmission and / or reception means operating in a wavelength band compatible with the conditions of transmission between said second means and said earth stations, the range of said second means being less than the dimensions of the area of poor reception conditions of the centimeter waves.

Le procédé selon l'invention présente de nombreux avantages. Tout d'abord, de nombreux agencements sont déjà implantés en milieu urbain, en des points particuliers de la zone globale de mauvaises conditions de transmission dans lesquels la liaison avec le satellite reste possible. Il s'agit par exemple des panneaux de signalisation routière disposés sur les boulevards périphériques entourant des centres urbains importants, ou des panneaux d'affichages présentant un volume intérieur disponible permettant de loger un émetteur de forte puissance ou un récepteur sensible ainsi que les antennes correspondantes, et qui en outre sont généralement déjà reliés à une source d'électricité. En conséquence, il est possible de constituer un réseau de transmission d'informations efficace sans réaliser d'investissements importants pour acquérir ou louer des emplacements coûteux pour l'implantation de stations au sol. Par ailleurs, le procédé selon l'invention évite la multiplication abusive de stations techniques dans un cadre urbain qui, du fait de la pression publique, présentera des exigences croissantes en ce qui concerne la protection de l'environnement esthétique.The method according to the invention has many advantages. First of all, many arrangements are already implemented in urban areas, at particular points in the global area of poor transmission conditions in which connection with the satellite remains possible. These are, for example, road signs placed on the peripheral boulevards surrounding large urban centers, or display panels with an available interior volume making it possible to house a strong transmitter. power or a sensitive receiver as well as the corresponding antennas, and which in addition are generally already connected to a source of electricity. As a result, it is possible to build an efficient information transmission network without making significant investments to acquire or rent expensive locations for the establishment of ground stations. Furthermore, the method according to the invention avoids the excessive proliferation of technical stations in an urban setting which, due to public pressure, will present increasing requirements with regard to the protection of the aesthetic environment.

Avantageusement, lesdits agencements sont constitués par des panneaux publicitaires reliés à une source d'énergie.Advantageously, said arrangements consist of advertising panels connected to an energy source.

Selon un mode de mise en oeuvre avantageux, lesdits agencements sont constitués par des panneaux d'informations comportant des moyens d'affichages de messages visuels. De tels panneaux constituent souvent un maillage étroit d'un site urbain. Ils sont relativement bien admis tant par les élus locaux, car ils constituent un vecteur de communication et de promotion de leur réalisation, voire de leur image, que par la population qui y trouve des informations culturelles ou pratiques utiles. Ces panneaux disposent d'un volume intérieur suffisant pour loger l'ensemble des moyens techniques de transmission. En outre, le procédé selon l'invention peut comporter des moyens de détection d'un signal de priorité apte à déclencher l'émission d'un message radiodiffusé, télédiffusé et/ou à déclencher l'affichage d'un message visuel sur ledit agencement. Ce message peut être une annonce de l'imminence d'une catastrophe naturelle ou politique, ou simplement de prévention d'un danger.According to an advantageous embodiment, said arrangements are constituted by information panels comprising means for displaying visual messages. Such signs often constitute a close mesh of an urban site. They are relatively well accepted both by local elected officials, as they constitute a vector of communication and promotion of their achievement, even of their image, as well as by the population who find useful cultural or practical information there. These panels have sufficient internal volume to accommodate all of the technical means of transmission. In addition, the method according to the invention may include means for detecting a priority signal capable of triggering the emission of a radio broadcast message, and / or of triggering the display of a visual message on said arrangement. . This message can be an announcement of the impending natural or political disaster, or simply the prevention of a danger.

Selon une autre variante avantageuse, le procédé selon l'invention consiste en ce que l'on intègre en outre dans lesdits agencements des moyens de localisation de stations terrestres mobiles susceptibles de se déplacer dans la zone de mauvaises conditions de réception, lesdits moyens de localisations générant un signal représentatif de la position de ladite station terrestre mobile, ledit signal étant transmis au satellite.According to another advantageous variant, the method according to the invention consists in that one further integrates into said arrangements means for locating mobile earth stations capable of moving in the area of poor reception conditions, said locating means generating a signal representative of the position of said mobile earth station, said signal being transmitted to the satellite.

La présente invention concerne également un panneau d'affichage publicitaire pour la mise en oeuvre du procédé précédemment exposé caractérisé en ce qu'il comporte une première antenne coopérant avec des moyens d'émission et/ou de réception de signaux provenant ou destinés à un satellite de communication, et une deuxième antenne coopérant avec des moyens d'émission et/ou de réception de signaux provenant ou destinés à des stations terrestres disposées dans une zone de mauvaises conditions de transmission d'ondes centimétriques. Le panneau selon ce mode de réalisation peut être substitué à un panneau existant et remplir une double fonction d'affichage et de relais pour les signaux considérés.The present invention also relates to an advertising display panel for the implementation of the method described above, characterized in that it comprises a first antenna cooperating with means for transmitting and / or receiving signals from or intended for a satellite. communication, and a second antenna cooperating with means for transmitting and / or receiving signals from or intended for earth stations located in an area of poor centimetric wave transmission conditions. The panel according to this embodiment can be substituted for an existing panel and fulfill a double display and relay function for the signals considered.

Selon un autre mode de réalisation, l'invention est constituée par un panneau d'affichage d'informations visuels provenant d'un serveur central de gestion des messages d'informations. Il comporte une première antenne coopérant avec des moyens d'émission et/ou de réception de signaux provenant ou destinés à un satellite de communication, et une deuxième antenne coopérant avec des moyens d'émission et/ou de réception de signaux provenant ou destinés à des stations terrestres disposées dans une zone de mauvaises conditions de transmission d'ondes centimétriques.According to another embodiment, the invention consists of a display panel of visual information originating from a central server for managing information messages. It comprises a first antenna cooperating with means for transmitting and / or receiving signals from or intended for a communication satellite, and a second antenna cooperating with means for transmitting and / or receiving signals originating from or intended for earth stations located in an area of poor centimetric wave transmission conditions.

Selon une variante avantageuse, ledit panneau d'affichage d'informations visuelles comporte en outre un détecteur d'un signal de priorité générant un signal d'interruption de l'affichage du message d'information provenant dudit serveur central et provoquant l'affichage d'un message d'information prioritaire et/ou l'émission d'un message prioritaire par voie hertzienne dans la bande de fréquence des récepteurs de stations terrestres.According to an advantageous variant, said visual information display panel further comprises a detector of a priority signal generating a signal to interrupt the display of the information message from said central server and causing the display of '' a priority information message and / or the transmission of a priority message over the air in the frequency band of receivers of earth stations.

Selon un autre mode de mise en oeuvre, l'invention consiste en un panneau de signalisation routière comportant une première antenne coopérant avec des moyens d'émission et/ou de réception de signaux provenant ou destinés à un satellite de communication, et une deuxième antenne coopérant avec des moyens d'émission et/ou de réception de signaux provenant ou destinés à des stations terrestres disposées dans une zone de mauvaises conditions de transmission d'ondes centimétriques.According to another embodiment, the invention consists of a road sign comprising a first antenna cooperating with means for transmitting and / or receiving signals from or intended for a communication satellite, and a second antenna cooperating with means for transmitting and / or receiving signals from or intended for earth stations located in an area of poor centimetric wave transmission conditions.

Selon une variante,l'agencement pour la mise en oeuvre de l'invention comporte un émetteur apte à activer l'émission par un système embarqué sur une station terrestre mobile déterminée d'un signal codé, ledit signal codé étant détecté par un récepteur goniométrique équipant ledit agencement, ledit agencement comportant en outre des moyens de transmission à un satellite de communication d'un signal relatif à la position de ladite station terrestre mobile déterminée.According to a variant, the arrangement for implementing the invention comprises a transmitter capable of activating the transmission by an on-board system on a determined mobile land station of a coded signal, said coded signal being detected by a goniometric receiver equipping said arrangement, said arrangement further comprising means for transmitting to a communication satellite a signal relating to the position of said determined mobile earth station.

La présente invention sera mieux comprise à la lecture de la description qui suit d'un exemple de réalisation particulier non limitatif, illustré par les dessins où :

  • la figure 1 représente un schéma général d'un réseau conforme à l'invention
  • la figure 2 représente le schéma général d'un deuxième mode de réalisation.
The present invention will be better understood on reading the following description of a particular nonlimiting exemplary embodiment, illustrated by the drawings in which:
  • FIG. 1 represents a general diagram of a network according to the invention
  • FIG. 2 represents the general diagram of a second embodiment.

La figure 1 représente un exemple de mise en oeuvre de l'invention. Les signaux à transmettre sont dans l'exemple décrit des signaux de radiodiffusion provenant de l'émetteur (1) d'une station de radio. Ces signaux sont du type numérique, et sont transmis de façon connue à un satellite de télécommunication 2. Ce satellite réémet des signaux UHF dans une bande de fréquence comprise entre 1 Mhz et 1500 Mhz. Au sol, une station de réception (3) reçoit les signaux numériques provenant du satellite 2. Cette station de réception au sol (4) est constituée par un panneau de signalisation de type connu. Il est relié au réseau de distribution d'énergie électrique pour assurer l'alimentation des fonctions d'affichages. Cette alimentation sert en outre à assurer le fonctionnement des moyens d'émission et de réception. La partie supérieure du panneau présente une surface orientée (4) dans laquelle est logée une antenne de réception de signaux centimétriques. L'inclinaison et la taille de l'antenne sont déterminées de façon connue par l'Homme de métier.FIG. 1 represents an example of implementation of the invention. The signals to be transmitted are, in the example described, broadcasting signals originating from the transmitter (1) of a radio station. These signals are of the digital type, and are transmitted in a known manner to a telecommunications satellite 2. This satellite re-transmits UHF signals in a frequency band between 1 Mhz and 1500 MHz. On the ground, a reception station (3) receives the digital signals coming from the satellite 2. This reception station on the ground (4) is constituted by a signaling panel of known type. It is connected to the electrical energy distribution network to supply the display functions. This supply also serves to ensure the operation of the transmission and reception means. The upper part of the panel has an oriented surface (4) in which is housed an antenna for receiving centimeter signals. The inclination and the size of the antenna are determined in a manner known to the skilled person.

Le panneau (3) comporte en outre un émetteur travaillant à une fréquence favorable à la transmission dans une zone urbaine ou de façon plus générale dans une zone dans laquelle les conditions de transmission des ondes centimétriques sont mauvaises. A titre d'exemple, la fréquence d'émission est de l'ordre de 100 Mhz. Les signaux numériques provenant de la liaison avec le satellite sont réémis dans la longueur d'onde susmentionnée afin d'être captés dans des conditions satisfaisantes par des récepteurs mobiles, ou de petite dimension et d'un coût de revient faible. A titre d'exemple, ces signaux sont reçus par des récepteurs disposés dans des voitures automobiles (5). Ce mode de réception est par ailleurs complémentaire avec une réception directe par certains véhicules (6) ou par des stations fixes de conception plus élaborée.The panel (3) further comprises a transmitter working at a frequency favorable to transmission in an urban area or more generally in an area in which the conditions of transmission of centimeter waves are poor. By way of example, the transmission frequency is of the order of 100 MHz. The digital signals originating from the link with the satellite are retransmitted in the aforementioned wavelength in order to be received under satisfactory conditions by mobile receivers, or of small dimensions and of a low cost price. By way of example, these signals are received by receivers arranged in motor cars (5). This reception mode is also complementary with direct reception by certain vehicles (6) or by fixed stations of more elaborate design.

Un deuxième centre d'émission (7) peut être prévu pour la transmission de signaux d'alerte. Ce deuxième centre de transmission (7) est destiné à envoyer des messages d'alerte prioritaires. Ces messages sont retransmis comme les autres signaux par satellite. La station au sol (3) comporte des moyens de reconnaissance des signaux d'alerte, par exemple grâce à un code particulier constituant le préambule du message numérique codé. La reconnaissance d'une telle chaîne de caractère déclenche l'interruption des émissions non prioritaires et l'émission dans la bande de fréquence choisie pour la communication au sol d'un message d'alerte. Ce message d'alerte peut également être émis à une fréquence correspondant à la fréquence intermédiaire des récepteurs employés par les utilisateurs. Par ailleurs, la reconnaissance du message d'alerte peut provoquer l'apparition sur le panneau de signalisation (3) l'apparition d'un message se substituant au moins partiellement au message publicitaire ou informatif habituel.A second transmission center (7) can be provided for the transmission of warning signals. This second transmission center (7) is intended to send priority alert messages. These messages are retransmitted like other satellite signals. The ground station (3) comprises means for recognizing the warning signals, for example by means of a particular code constituting the preamble of the coded digital message. The recognition of such a character string triggers the interruption of non-priority transmissions and the transmission in the frequency band chosen for the ground communication of an alert message. This alert message can also be sent at a frequency corresponding to the intermediate frequency of the receivers used by the users. Furthermore, the recognition of the alert message can cause the appearance on the road sign (3) of the appearance of a message at least partially replacing the usual advertising or informational message.

Ce message permet d'avertir une population importante de l'imminence d'un danger naturel tel qu'un tremblement de terre ou d'une tempête et de diffuser des consignes de sécurité.This message is used to warn a large population of the impending natural danger such as an earthquake or a storm and to disseminate safety instructions.

La figure 2 représente une vue d'un autre mode de réalisation. Il est plus particulièrement destiné au guidage de véhicule et à la gestion d'une flotte de véhicules, par exemple des camions de livraison ou des taxis, à partir d'une station centrale d'émission-réception et de traitement. L'invention consiste à mettre en place un maillage de balises (8) de faible portée intégré dans un mobilier ayant une autre fonction principale. Il peut s'agir par exemple de feux de signalisation constituant un maillage dense d'une zone urbaine, ou de panneau indicateur de direction constituant un maillage efficace du réseau routier. Certaines au moins de ces balises comportent des moyens d'émission-réception fonctionnant dans la bande centimétrique et communiquant avec le satellite (2). Ces balises (10) comportent une antenne de réception des faisceaux hertziens centimétriques et/ou d'émission dans ladite bande de fréquence. La liaison entre ces balises principales (10) et les balises secondaires (8) s'effectue soit par liaison hertzienne dans des bandes de fréquence adaptées à la transmission dans la zone considérée, ou par une liaison câblée. Les balises secondaires (8) comportent des moyens de communication avec la ou les balises principales (10) ainsi que des moyens d'échange d'informations avec des récepteurs et/émetteurs embarqués.FIG. 2 represents a view of another embodiment. It is more particularly intended for guiding a vehicle and managing a fleet of vehicles, for example delivery trucks or taxis, from a central transceiver and processing station. The invention consists in setting up a mesh of tags (8) of short range integrated in furniture having another main function. These may for example be traffic lights constituting a dense network of an urban area, or direction indicator panel constituting an effective network of the road network. At least some of these beacons comprise transmission-reception means operating in the centimeter band and communicating with the satellite (2). These beacons (10) comprise an antenna for receiving centimeter-wide radio beams and / or for transmitting in said frequency band. The connection between these main beacons (10) and the secondary beacons (8) is carried out either by radio link in frequency bands adapted to the transmission in the zone considered, or by a cable connection. The secondary beacons (8) comprise means of communication with the main beacon or beacons (10) as well as means for exchanging information with onboard receivers and / transmitters.

Les échanges d'informations entre la balise secondaire (8) et un véhicule passant à proximité permettent de localiser ledit véhicule et de transmettre ses coordonnées au centre de traitement (11). Cette localisation peut être effectuée par des moyens goniométriques, ou encore par l'affectation à chaque balise d'une adresse transmise sous forme de séquence de codage lors de l'émission d'un message par ladite balise (8). La balise (8) comporte dans ce cas en outre un émetteur générant un signal d'activation d'un système d'identification embarqué dans les véhicules appartenant à la flotte considérée. Lors de la détection de ce signal d'activation, l'émetteur embarqué répond par un signal codé comportant une séquence numérique d'identification du véhicule. La balise (8) reçoit cette réponse et émet à son tour un signal comportant une première séquence codée permettant l'identification de la balise la plus proche du véhicule considéré, et une deuxième séquence ccdée identifiant ledit véhicule. Ce signal codé est transmis au centre de traitement (11) par l'intermédiaire du satellite (2).The exchange of information between the secondary beacon (8) and a vehicle passing nearby makes it possible to locate said vehicle and to transmit its coordinates to the processing center (11). This localization can be carried out by goniometric means, or by assigning to each beacon an address transmitted in the form of a coding sequence when a message is transmitted by said beacon (8). The beacon (8) in this case further comprises a transmitter generating an activation signal of an on-board identification system in vehicles belonging to the fleet in question. Upon detection of this activation signal, the on-board transmitter responds with a coded signal comprising a digital vehicle identification sequence. The beacon (8) receives this response and in turn transmits a signal comprising a first coded sequence allowing the identification of the beacon closest to the vehicle in question, and a second ccded sequence identifying said vehicle. This coded signal is transmitted to the processing center (11) via the satellite (2).

La figure 3 représente le schéma de principe d'un panneau de signalisation pour la mise en oeuvre de l'invention.FIG. 3 represents the block diagram of a traffic sign for the implementation of the invention.

A titre d'exemple, on décrira un exemple de réalisation correspondant à un panneau d'information urbaine présentant une fenêtre d'affichage (12) d'un texte. Ce type de panneau est mis en place dans de nombreuses villes pour la diffusion d'informations sur la vie municipale ou culturelle, ou encore relatives à la circulation. Ce panneau est relié au réseau de distribution électrique ainsi qu'à un réseau (13) véhiculant les signaux numériques provenant d'un centre de commande commandant les affichages à faire apparaître sur lesdits panneaux.By way of example, an exemplary embodiment will be described corresponding to an urban information panel having a display window (12) for a text. This type of sign is set up in many cities for the dissemination of information on municipal or cultural life, or even relating to traffic. This panel is connected to the electrical distribution network as well as to a network (13) carrying the digital signals coming from a command center controlling the displays to be displayed on said panels.

Le panneau est muni d'une antenne (14) de réception et d'émission de signaux hertziens de communication avec un satellite. Cette antenne (14) est reliée d'une part à un récepteur (15) et d'autre part à un émetteur (16). Les signaux numériques provenant du récepteur (15) sont transmis à un dispositif de reconnaissance de séquences de caractères identifiant les messages d'alerte prioritaires. Lorsque ledit circuit reconnait la séquence annonçant un message prioritaire, il adresse un signal d'interruption de l'affichage des messages diffusés sur le réseau (13) à un circuit (18) et adresse un signal numérique au générateur de caractères commandant l'affichage d'un message d'urgence sur le panneau (12). Par ailleurs, les signaux numériques provenant du récepteur (15) des signaux satellites sont transmis à un émetteur (20) après traitement dans un circuit (21). L'émetteur (20) est relié à une antenne de radiocommunication (22) de type connu.The panel is provided with an antenna (14) for receiving and transmitting radio communication signals with a satellite. This antenna (14) is connected on the one hand to a receiver (15) and on the other hand to a transmitter (16). The digital signals from the receiver (15) are transmitted to a character sequence recognition device identifying priority alert messages. When said circuit recognizes the sequence announcing a priority message, it sends a signal to interrupt the display of messages broadcast on the network (13) to a circuit (18) and sends a digital signal to the character generator controlling the display. an emergency message on the panel (12). Furthermore, the digital signals coming from the receiver (15) of the satellite signals are transmitted to a transmitter (20) after processing in a circuit (21). The transmitter (20) is connected to a radiocommunication antenna (22) of known type.

L'antenne reçoit par ailleurs des signaux provenant des émetteurs embarqués sur les véhicules de la flotte. Ces signaux sont de deux types : d'une part des signaux de repérage de la position du véhicule émit par un émetteur embarqué activé par un signal émis par le panneau considéré. Ces signaux comportent une séquence codée permettant l'identification du véhicule. Ces signaux sont captés par un premier récepteur (23) et transmis à un multiplexeur (24) recevant d'un générateur (25) par ailleurs une séquence codée permettant d'identifier le panneau, et en conséquence la position approximative du véhicule. Les signaux reçus correspondent également à des messages vocaux ou à des signaux codés, qui sont transmis au multiplexeur (24) par l'intermédiaire d'un récepteur spécifique (26). La gestion de ces signaux pour un envoi sous forme de paquets ainsi que la coordination avec les autres panneaux réemetteurs s'effectue grâce au multiplexeur (24) auquel sont associés des circuits d'horloge et de synchronisation de type connu.The antenna also receives signals from the transmitters on board fleet vehicles. These signals are of two types: on the one hand, signals for locating the position of the vehicle emitted by an on-board transmitter activated by a signal emitted by the panel considered. These signals include a coded sequence allowing the identification of the vehicle. These signals are picked up by a first receiver (23) and transmitted to a multiplexer (24) receiving from a generator (25) also a coded sequence making it possible to identify the panel, and consequently the approximate position of the vehicle. The received signals also correspond to voice messages or coded signals, which are transmitted to the multiplexer (24) via a specific receiver (26). The management of these signals for sending in the form of packets as well as the coordination with the other panels re-transmitters are effected by means of the multiplexer (24) with which clock and synchronization circuits of known type are associated.

La présente invention n'est aucunement limitée aux modes de réalisation exposés dans ce qui précède, mais s'étend au contraire à de nombreuses variantes de mode de mise en oeuvre.The present invention is in no way limited to the embodiments set out in the foregoing, but on the contrary extends to numerous alternative embodiments.

Claims (11)

1 - Procédé de transmission d'informations par voie hertzienne notamment entre un satellite (2) et une pluralité de stations terrestres (5) dont certaines au moins sont disposées dans des zones de mauvaises conditions de transmissions des ondes centimétriques, ledit procédé mettant en oeuvre des relais comportant des moyens de réception et des moyens émetteurs caractérisé en ce que l'on intègre dans une pluralité d'agencements (3) urbains ou ruraux ayant une fonction principale de signalisation, de décoration et/ou de présentation d'informations une première série de moyens d'émission et/ou de réception opérant dans les longueurs d'onde utilisées pour la communication avec ledit satellite et au moins une deuxième série de moyens d'émission et/ou de réception opérant dans une bande de longueur d'onde compatible avec les conditions de transmissions entre lesdits deuxièmes moyens et lesdites stations terrestres (5), la portée desdits deuxièmes moyens étant inférieure ou égale aux dimensions de la zone de mauvaises conditions de réception des ondes centimétriques. 1 - Method for transmitting information over the air, in particular between a satellite (2) and a plurality of earth stations (5), at least some of which are located in areas of poor centimetric wave transmission conditions, said method implementing relays comprising reception means and transmitting means characterized in that one integrates into a plurality of urban or rural layouts (3) having a main function of signaling, decoration and / or presentation of information a first series of transmission and / or reception means operating in the wavelengths used for communication with said satellite and at least a second series of transmission and / or reception means operating in a wavelength band compatible with the conditions of transmission between said second means and said earth stations (5), the range of said second means being in smaller than or equal to the dimensions of the zone for poor reception conditions of the centimeter waves. 2 - Procédé de transmission d'informations par voie hertzienne entre un satellite (2) et une pluralité de stations terrestres (5) selon la revendication 1 caractérisé en ce que lesdits agencements (3) sont constitués par des panneaux publicitaires et en ce qu'ils sont reliés à une source d'énergie. 2 - Method for transmitting information over the air between a satellite (2) and a plurality of earth stations (5) according to claim 1 characterized in that said arrangements (3) are constituted by advertising panels and in that they are connected to a source of energy. 3 - Procédé de transmission d'informations par voie hertzienne entre un satellite et une pluralité de stations terrestres (5) selon la revendication 1 caractérisé en ce que lesdits agencements (3) sont constitués par des panneaux de signalisation routière. 3 - A method of transmitting information over the air between a satellite and a plurality of earth stations (5) according to claim 1 characterized in that said arrangements (3) are constituted by road signs. 4 - Procédé de transmission d'informations par voie hertzienne entre un satellite et une pluralité de stations terrestres selon la revendication 1 caractérisé en ce que lesdits agencements (3) sont constitués par des panneaux d'information comportant des moyens d'affichages de messages visuels. 4 - Method for transmitting information over the air between a satellite and a plurality of earth stations according to claim 1 characterized in that said arrangements (3) are constituted by information panels comprising means for displaying visual messages . 5 - Procédé de transmission d'informations par voie hertzienne entre un satellite (2) et une pluralité de stations terrestres (5) selon l'une quelconque des revendications précédentes caractérisé en ce que l'on intègre en outre dans lesdits agencements (3) des moyens de localisation de stations terrestres mobiles susceptibles de se déplacer dans la zone de mauvaises conditions de réception., lesdits moyens de localisations générant un signal représentatif de la position de ladite station terrestre mobile, ledit signal étant transmis au satellite (2). 5 - Method for transmitting information over the air between a satellite (2) and a plurality of earth stations (5) according to any one of the preceding claims, characterized in that one also integrates into said arrangements (3) means for locating mobile earth stations capable of moving in the area of poor reception conditions., said locating means generating a signal representative of the position of said mobile earth station, said signal being transmitted to the satellite (2). 6 - Procédé de transmission d'informations par voie hertzienne entre un satellite et une pluralité de stations terrestres selon l'une quelconque des revendications précédentes caractérisé en ce que l'on intègre en outre dans lesdits agencements des moyens de détection d'un signal de priorité apte à déclencher l'émission d'un message radiodiffusé, télédiffusé et/ou à déclencher l'affichage d'un message visuel sur ledit agencement. 6 - A method of transmitting information over the air between a satellite and a plurality of earth stations according to any one of the preceding claims, characterized in that one additionally integrates into said arrangements means for detecting a signal of priority suitable for triggering the transmission of a radio broadcast message, and / or for triggering the display of a visual message on said arrangement. 7 - Panneau d'affichage publicitaire pour la mise en oeuvre du procédé selon l'une quelconque des revendications 1 à 6 caractérisé en ce qu'il comporte une première antenne coopérant avec des moyens d'émission et/ou de réception de signaux provenant ou destinés à un satellite de communication, et une deuxième antenne coopérant avec des moyens d'émission et/ou de réception de signaux provenant ou destinés à des stations terrestres (5) disposés dans une zone de mauvaises conditions de transmission d'ondes centimétriques. 7 - Advertising display panel for the implementation of the method according to any one of claims 1 to 6 characterized in that it comprises a first antenna cooperating with means for transmitting and / or receiving signals from or intended for a satellite communication, and a second antenna cooperating with means for transmitting and / or receiving signals from or intended for earth stations (5) arranged in an area of poor centimetric wave transmission conditions. 8 - Panneau d'affichage d'informations visuels provenant d'un serveur central de gestion des messages d'informations pour la mise en oeuvre du procédé selon l'une quelconque des revendications 1 à 6 caractérisé en ce qu'il comporte une première antenne coopérant avec des moyens d'émission et/ou de réception de signaux provenant ou destinés à un satellite de communication, et une deuxième antenne coopérant avec des moyens d'émission et/ou de réception de signaux provenant ou destinés à des stations terrestres disposées dans une zone de mauvaises conditions de transmission d'ondes centimétriques. 8 - Display panel of visual information from a central server for managing information messages for the implementation of the method according to any one of claims 1 to 6 characterized in that it comprises a first antenna cooperating with means for transmitting and / or receiving signals from or intended for a communication satellite, and a second antenna cooperating with means for transmitting and / or receiving signals originating from or intended for earth stations arranged in an area of poor centimetric wave transmission conditions. 9 - Panneau d'affichage d'informations visuelles provenant d'un serveur central de gestion des messages d'informations selon la revendication 8 caractérisé en ce qu'il comporte en outre un détecteur d'un signal de priorité générant un signal d'interruption de l'affichage du message d'information provenant dudit serveur central et provoquant l'affichage d'un message d'information prioritaire et/ou l'émission d'un message prioritaire par voie hertzienne dans la bande de fréquence des récepteurs de stations terrestres. 9 - Visual information display panel from a central server for managing information messages according to claim 8 characterized in that it further comprises a detector of a priority signal generating an interrupt signal the display of the information message from said central server and causing the display of a priority information message and / or the transmission of a priority message over the air in the frequency band of receivers of land stations . 10 - Panneau de signalisation routière pour la mise en oeuvre du procédé selon l'une quelconque des revendications 1 à 6 caractérisé en ce qu'il comporte une première antenne coopérant avec des moyens d'émission et/ou de réception de signaux provenant ou destinés à un satellite de communication, et une deuxième antenne coopérant avec des moyens d'émission et/ou de réception de signaux provenant ou destinés à des stations terrestres disposées dans une zone de mauvaises conditions de transmission d'ondes centimétriques. 10 - Road sign for implementing the method according to any one of claims 1 to 6 characterized in that it comprises a first antenna cooperating with means for transmitting and / or receiving signals from or intended a communication satellite, and a second antenna cooperating with means for transmitting and / or receiving signals from or intended for earth stations located in an area of poor centimetric wave transmission conditions. 11 - Agencement pour la mise en oeuvre du procédé selon la revendication 5 caractérisé en ce qu'il comporte un émetteur apte à activer l'émission par un système embarqué sur une station terrestre mobile déterminée d'un signal codé, ledit signal codé étant détecté par un récepteur goniométrique équipant ledit agencement, ledit agencement comportant en outre des moyens de transmission à un satellite de communication d'un signal relatif à la position de ladite station terrestre mobile déterminée. 11 - Arrangement for implementing the method according to claim 5 characterized in that it comprises a transmitter capable of activating the transmission by an on-board system on a determined mobile land station of a coded signal, said coded signal being detected by a goniometric receiver equipping said arrangement, said arrangement further comprising means for transmitting to a communication satellite a signal relating to the position of said determined mobile earth station.
EP91403296A 1990-12-05 1991-12-05 Method of transmitting information by radio waves between a satellite and a plurality of ground stations, and arrangements for the implementation of the system Expired - Lifetime EP0489661B1 (en)

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FR9015224A FR2670344A1 (en) 1990-12-05 1990-12-05 METHOD FOR TRANSMITTING INFORMATION OVER THE AIR BETWEEN A SATELLITE AND A PLURALITY OF EARTH STATIONS AND ARRANGEMENTS FOR IMPLEMENTING SAID METHOD.
FR9015224 1990-12-05

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Cited By (12)

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EP0724339A2 (en) * 1995-01-27 1996-07-31 NEC Corporation Mobile satellite communication terminal
EP0724339A3 (en) * 1995-01-27 1999-06-02 NEC Corporation Mobile satellite communication terminal
EP0748063A2 (en) * 1995-06-06 1996-12-11 Globalstar L.P. Low earth orbit communication satellite gateway-to-gateway relay system
EP0748063A3 (en) * 1995-06-06 1998-01-07 Globalstar L.P. Low earth orbit communication satellite gateway-to-gateway relay system
WO1997011536A1 (en) * 1995-09-22 1997-03-27 Qualcomm Incorporated Method and apparatus for diversity enhancement using pseudo-multipath signals
US5991345A (en) * 1995-09-22 1999-11-23 Qualcomm Incorporated Method and apparatus for diversity enhancement using pseudo-multipath signals
EP0829974A2 (en) * 1996-09-17 1998-03-18 Alcatel Espace Repeater for a radio communication system
FR2753589A1 (en) * 1996-09-17 1998-03-20 Alcatel Espace RELAY FOR RADIO COMMUNICATION SYSTEM
EP0829974A3 (en) * 1996-09-17 1999-02-03 Alcatel Espace Repeater for a radio communication system
US6188719B1 (en) 1996-09-17 2001-02-13 Alcatel Espace Radiocommunication system repeater
FR2784535A1 (en) * 1998-10-13 2000-04-14 Dassault Automatismes Automatic fixed or moving image presentation device, e.g. for public display on building exterior, stores tagged image sequences decoded from data stream over satellite link, reproducing them in order determined remotely
US7653348B2 (en) 2004-11-16 2010-01-26 Atc Technologies, Llc Satellite communications systems, components and methods for operating shared satellite gateways

Also Published As

Publication number Publication date
DE69119041D1 (en) 1996-05-30
ATE137370T1 (en) 1996-05-15
FR2670344A1 (en) 1992-06-12
EP0489661B1 (en) 1996-04-24
FR2670344B1 (en) 1994-07-13

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